[SCSI] st: rename flush_write_buffer()

This patch fixes the following namespace collision with
include/asm-avr32/cacheflush.h :

<--  snip  -->

...
  CC [M]  drivers/scsi/st.o
/home/bunk/linux/kernel-2.6/git/linux-2.6/drivers/scsi/st.c:629:53: error: macro "flush_write_buffer" passed 1 arguments, but takes just 0
...
make[3]: *** [drivers/scsi/st.o] Error 1

<--  snip  -->

st now uses st_flush_write_buffer()

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index d204aad..df83bea 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -628,7 +628,7 @@
 
 
 /* Flush the write buffer (never need to write if variable blocksize). */
-static int flush_write_buffer(struct scsi_tape * STp)
+static int st_flush_write_buffer(struct scsi_tape * STp)
 {
 	int offset, transfer, blks;
 	int result;
@@ -719,7 +719,7 @@
 		return 0;
 	STps = &(STp->ps[STp->partition]);
 	if (STps->rw == ST_WRITING)	/* Writing */
-		return flush_write_buffer(STp);
+		return st_flush_write_buffer(STp);
 
 	if (STp->block_size == 0)
 		return 0;
@@ -1214,7 +1214,7 @@
 		return 0;
 
 	if (STps->rw == ST_WRITING && !STp->pos_unknown) {
-		result = flush_write_buffer(STp);
+		result = st_flush_write_buffer(STp);
 		if (result != 0 && result != (-ENOSPC))
 			goto out;
 	}